makehuman visemes to shape keys for unity
Since there are not enough details in your question, there are many things that can go wrong. 

Two things to note: 

1) When you import mhx2 into Blender, you must choose to override the default settings at the import menu at the bottom left: 

​Override Exported Data: Checked;

Import Human Type: Base, Offset, Face Shapes;

Masking: Apply, Conservation Mask;

Rigging: Add Rig, Rig Type - Exported, Custom Shapes.

2) Make sure you export your model from Blender in a fbx file. 

3) Import your fbx file into Unity. Before you drag it into the view/hierarchy, make sure that in Inspector you have the box ticked for importing face shapes - should be the default but just in case. 

This tutorial is for a plugin for lip sync in Unity, which uses blend shapes/face shapes. You may or may not need it but the first half of the tutorial is very useful for your case. If you follow it step by step, you should be able to get the blend shapes/face shapes into Unity successfully.